Sum of squares of numbers from 1 to N

Swift Easy loops

Task «Sum of squares of numbers from 1 to N»

Write a program that takes a positive integer N as input and calculates the sum of squares of all integers from 1 to N inclusive. Use a for or while loop. It is guaranteed that N does not exceed 1000.

Input Format

One integer N (1 ≤ N ≤ 1000).

Output Format

One integer — the sum of squares of numbers from 1 to N.

Examples

Example 1

INPUT

aaabbbcc

OUTPUT

a3b3c2

main.swift